2017A&A...608A..57V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST12:21:22

2017A&A...608A..57V - Astronomy and Astrophysics, volume 608A, 57-57 (2017/12-1)

The observed velocity distribution of young pulsars.

VERBUNT F., IGOSHEV A. and CATOR E.

Abstract (from CDS):

We argue that comparison with observations of theoretical models for the velocity distribution of pulsars must be done directly with the observed quantities, that is parallax and the two components of proper motion. We have developed a formalism to do so, and applied it to pulsars with accurate VLBI measurements. For computational convenience, we model the data with Maxwellians. We find that a distribution with two Maxwellians improves significantly on a single Maxwellian. The "mixed" model takes into account that pulsars move away from their place of birth, a narrow region around the Galactic plane. The best model has 42% of the pulsars in a Maxwellian with average velocity {sigma(sqrt(8/π))=120km/s, and 58% in a Maxwellian with average velocity 540km/s. About 5% of the pulsars has a velocity at birth less than 60km/s. For the youngest pulsars (τc<10Myr), these numbers are 32% with 130km/s, 68% with 520km/s, and 3%, with appreciable uncertainties. Our analysis shows that the velocity distribution is wider than can be described with a single Maxwellian; it does not prove that two Maxwellians provide a better description than other wide models.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: neutron - pulsars: general - methods: statistical - methods: statistical

Simbad objects: 30

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Number of rows : 30

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 PSR B0031-07 Psr 00 34 08.86 -07 21 53.4           ~ 273 0
2 PSR J0108-1431 Psr 01 08 08.29 -14 31 48.5           ~ 92 0
3 PSR B0136+57 Psr 01 39 19.744 +58 14 31.73           ~ 136 0
4 PSR B0329+54 Psr 03 32 59.3462817079 +54 34 45.047901390           ~ 576 1
5 PSR B0355+54 Psr 03 58 53.7165 +54 13 13.727           ~ 389 1
6 PSR B0450+55 Psr 04 54 07.709 +55 43 41.51           ~ 148 0
7 PSR J0538+2813 Psr 05 38 25.06 +28 17 11.0           ~ 166 2
8 PSR B0628-28 Psr 06 30 49.478 -28 34 43.13           ~ 265 0
9 PSR B0656+14 Psr 06 59 48.183 +14 14 21.54   24.85 24.90     ~ 759 1
10 PSR B0809+74 Psr 08 14 59.500 +74 29 05.70           ~ 363 0
11 PSR B0818-13 Psr 08 20 26.3670 -13 50 55.490           ~ 182 0
12 PSR B0919+06 Psr 09 22 14.008 +06 38 22.84           ~ 245 0
13 PSR B0950+08 Psr 09 53 09.3 +07 55 36           ~ 689 2
14 PSR B1133+16 Psr 11 36 03.180 +15 51 09.62           ~ 607 0
15 PSR B1237+25 Psr 12 39 40.386 +24 53 49.87           ~ 408 0
16 PSR B1508+55 Psr 15 09 25.7 +55 31 33           ~ 267 1
17 PSR B1541+09 Psr 15 43 38.815 +09 29 16.50           ~ 180 0
18 PSR B1556-44 Psr 15 59 41.535 -44 38 46.11           ~ 113 0
19 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3452 3
20 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11542 0
21 PSR B1929+10 Psr 19 32 13.79 +10 59 33.2           ~ 695 0
22 PSR B1933+16 Psr 19 35 47.7012077756 +16 16 40.025845719           ~ 269 1
23 PSR B2016+28 Psr 20 18 03.9004752640 +28 39 54.932845661           ~ 331 0
24 PSR B2020+28 Psr 20 22 37.0671 +28 54 23.104           ~ 282 1
25 PSR B2021+51 Psr 20 22 49.8730 +51 54 50.233           ~ 241 1
26 PSR B2045-16 Psr 20 48 35.446 -16 16 43.00           ~ 284 0
27 PSR B2053+36 Psr 20 55 31.3552 +36 30 21.489           ~ 87 0
28 PSR J2144-3939 Psr 21 44 12.10 -39 33 55.2           ~ 94 0
29 PSR B2154+40 Psr 21 57 01.840 +40 17 45.89           ~ 131 0
30 PSR B2310+42 Psr 23 13 08.5976 +42 53 12.987           ~ 120 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-12:21:22

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